Quercetin is a naturally occurring plant pigment, or flavonoid, found in many fruits, vegetables, grains, and leaves. It is one of the most abundant flavonoids in the human diet. As a flavonoid, quercetin is a type of antioxidant, molecules that can neutralize unstable atoms known as free radicals that can cause damage to cells. Common dietary sources include apples, berries, citrus fruits, grapes, onions, broccoli, and green tea. It is also available in supplement form.
While quercetin has been studied for various potential health benefits, it is important to note that many of these studies are preliminary or conducted in laboratory settings or animals, and human clinical trials are ongoing to confirm its efficacy and safety for specific health conditions. The compound is often included in research related to longevity due to its antioxidant and anti-inflammatory properties (Examine.com). Quercetin is metabolized in the body, primarily in the small intestine and liver, and its bioavailability can vary depending on the form and presence of other compounds, such as vitamin C or bromelain, which are sometimes co-formulated (PubChem).
Deep dive
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Known interactions
Category rule: glp1 × supplement
Note
GLP-1 medications slow stomach emptying, changing how/when oral supplements absorb; rapid weight loss raises the importance of protein and micronutrients.
Time oral supplements when nausea is lowest; prioritize protein and micronutrients; discuss with your provider.
Category rule: supplement × medication
Note
Some supplements change how the body processes medications (absorption, liver enzymes, or additive effects).
Specific pairs are checked against a licensed drug database and shown with their own severity. Always confirm with your provider or pharmacist.
Frequently asked
Sources referenced
["Cochrane Library","Examine.com","MedlinePlus","NIH Office of Dietary Supplements (ODS)","PubChem"]
Stackwise compiles summaries from publicly available scientific and regulatory references. Always verify important decisions with a licensed clinician.
Related compounds
Others in the supplement category or studied for the same goals.
